Malicious PDF — malware analysis report

Static analysis result for SHA-256 558f3dc07cf5a274…

MALICIOUS

PDF

42.5 KB Created: 2021-05-14 05:37:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 50d56ef8f451ce53b2344e9e7a5e26d3 SHA-1: 622d8f2822fd2060687ed5f2235dadf1cac00ec3 SHA-256: 558f3dc07cf5a2749232e3ec266fa5eccc430100863d651972239b1224aeb1cb
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by an ML classifier as malicious. It contains a fake CAPTCHA lure, designed to trick the user into interacting with a malicious link. The embedded URI points to a URL that likely hosts a secondary payload for download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/406889139/reddit-coin-master-free-spins-game-hack PDF link annotation
    • http://elsenorcafe.com.co/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/robux-game_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004903.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4903 25704 bytes
SHA-256: a6736ffa3e29c438d27dfb6856fc8001683a13cac54e2ba6a76cbcdf44e20d84
font_01_sfnt_off0000844c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x844C 18060 bytes
SHA-256: ccf5ccc44795e70c5c18ecb3356edd3211558c7f4a4929a106554d4b04000f5d

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